Sight glass of welding mask



FIG. 1 is a perspective view of a sight glass of welding mask showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a reference view thereof when in use.

The broken lines in the drawing views are included for the purpose of illustrating the unclaimed portions of the sight glass of welding mask and form no part of the claimed design. 

CLAIM The ornamental design for a sight glass of welding mask, as shown and described. 